Ceiling-stone.



' No."789,820. PATENTEDMAY16,1905.

ADOLF SPEOHT, 113cm.

* Wane. 6

UNiinD STATES Patented May 16, 1905.

PATENT Darren.

ANNA SPECHT, OF DONAUESCHINGEN, GERMANY, ADMINISTRATRIX OF ADOLF SPECHT, DECEASED.

CEILING-STONE.

SPECIFICATION forming part of Letters Patent No. 789,820, dated May 16, 1905.

Application filed June 27,1904. Serial No. 214,395.

To all whom it may concern:

Be it known that ADoLF Srnorrr, deceased, a citizen of the German Empire, late of Konstanz, in the Grand Duchy of Baden,Germany, did invent a new and useful Improvement in Building, entitled Ceiling Stones, Rhomboid or Quadrate, Having Abutments and Truncated Corners, of which the following is a specification.

The subject of the present invention is a ceiling-stone of rhomboidal or quadratic form having abutments and provided with one or more truncated corners for the construction of flat ceilings. Such stone is displayed in the accompanying drawings.

Figure 1 shows a stone of rhomboidal form. Figs. 2 and 3 give various views of a stone which has a quadrate form. Figs. 4. and 5 give various views of ceilings wherein this stone is used. Figs. 6, 7, and 8 give sections through such stones with various profiles of their abutments.

When a ceiling is being constructed, as many of the stones at as may be needed for each interjoist are taken, all having the same breadth. Every two opposite side faces of said stones have been shaped into parallel abutments with whatever profiles serve best,or, in other words, provided with complementary shoulders and grooves, either angular or curved. By means of such abutments and by means of the truncation of their corners I), as appears in the outline delineated, such stones (6 can be pushed dovetailing one into the other. They may thus be placed remaining partly asunder or be pushed together until their truncated cor- .ADOLE SPEGHT, deceased, and desire, as the administratrix of his estate, to secure by Letters'Patent, is-

Adjustable ceiling-stones a rhomboid or quadrate in form having parallel abutmentsc'. 6., angular or curved complementary shoulders and gr0ovesin which they slide, for the construction of fiat ceilings; and also having one or more truncated corners b, by means whereof such stones may be brought into close contact or drawn apart as needed to accomplish the exact filling up of interjoists without the use of other means, all substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ANNA SPECI-IT, Achm'm'stwtt'rim 0f the estate 0 f Adol f Spec/Lt,

deceased.

Witnesses:

BENJAMIN F. LIEFELD, LUDWIG GRINBUL. 

